Registers – Coded record sensors – Particular sensor structure
Patent
1982-11-17
1985-01-22
Trafton, David L.
Registers
Coded record sensors
Particular sensor structure
235454, 235476, 250557, 250569, 382 10, G06K 710
Patent
active
044946910
ABSTRACT:
A scanner is provided with photosensors and a stationary registration mark placed on each side of the reading window. The registration mark is thus located in the reading field of the photosensors as long as no document is presented for scanning within the reading window. A document which arrives within the reading window is interposed between the registration mark and the photosensors. A comparison circuit coupled with the photosensors delivers a document-reading start signal when the reading signal no longer corresponds to a registration-mark reading signal stored in memory during a preceding reading operation, that is, when the front edge of the document begins to enter the reading window.
REFERENCES:
patent: 2512547 (1950-06-01), Kleis et al.
patent: 2807414 (1957-09-01), Howard
patent: 3163746 (1964-12-01), Hoeser
patent: 4147295 (1979-04-01), Nojiri et al.
patent: 4179621 (1979-12-01), Crean et al.
IBM Tech. Disc. Bul., vol. 24, No. 1B, Jun. 1981, Kida, "Short-Paper Detection in Paper Path", pp. 547-548.
IBM Tech. Disc. Bul., vol. 23, No. 7A, Dec. 1980, Perkins, "Paper Edge Sensor", pp. 2695-2696.
"Thomson-CSF"
Trafton David L.
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